Cerous nitrate

Ceric ammonium nitrate is prepared by electrolytic oxidation of cerous nitrate in nitric acid to ceric nitrate, followed by the addition of ammonium nitrate solution. It is separated from the solution by crystaUization. It may be prepared alternatively by dissolving cerium(II) oxide, Ce0 H20 in concentrated nitric acid followed by treatment with ammonium nitrate. 

Ceric Dihydrogen Orthoarsenate, Ce(H2As04)4.4Ha0, may be prepared by heating cerous nitrate (1 g.-mol.) and arsenic acid (4 g.-mols.) with concentrated nitric acid for several hours, distilling off most of the nitric acid, and allowing the liquid to crystallise. The salt sepax-ates as... 

Cerium Nitrate or Cerous Nitrate. See under Nitrates... 

SYNS CERIUM NITRATE CERIUM(3+) NITRATE CERIUM TRINITRATE CEROUS NITRATE DUSICNAN CERITY (CZECH) NITRIC ACID, CERIUM(3+) SALT (SCI, 9CI)... 

Ceric Ammonium Nitrate (Cerium Ammonium Nitrate, Ammonium Hexanitratocerate). Ce(N03)4.2NH4N03, mw 548.3, small prismatic yeUow crysts, sol in w ale. Prepd by electrolytic oxidation of cerous nitrate in nitric acid soln, and subsequently mixing solns of cerium nitrate and AN, foUowed by crystn. It is a strong oxidizing agent and a dangerous fire risk in contact with organic materials... 

E605 Daoud, E.W.R., McClellan, A.C. and Scott, M.G. (1990). Positive interferences with the Ektachem total COj assay from therapy with topical cerous nitrate. Clin. Chem. 56, 1521-1522. 

A leaching cycle begins by screw metering a batch of waste from the accumulation hopper into the top of the cylindrical bed. Next, a mixture of nitric acid, cerous nitrate and gadolinium nitrate is charged to the thermosiphon. Fluid circulation is induced by steam heating the HEPA bed and the thermosiphon leg. 

As the leachant circulates and approaches reflux temperature, an electrical potential is applied across the electrodes in the oxidizer tank that converts the cerous nitrate into a mixture of cerous and ceric nitrates. Since the latter species are either neutral or anions in solution, it is not necessary to separate the electrodes with a diaphragm in the electrolytic oxidation tank. However, the cathode is partly shielded with a cylindrical finger that surrounds it and air-sparged to remove nitrous acid which does reduce the ceric species. 

Benzylic Alcohol 10108-73-3 Cerous Nitrate 10476-81-0 Strontium Bromide... 

Aminopyrine (4-dimethylamino-2,3-dimethyl-l-phenyl-3-pyrazo-lin-5-one) forms complexes similar to those of antipyrine, but usually containing fewer molecules of the 3-pyrazolin-5-one. Complexes with mercury, cadmium, antimony, zinc and cobalt salts include only one molecule of aminopyrine. A number of complexes with cobalt, zinc and calcium salts have two molecules of aminopyrine, some also containing acid and water of hydration.736,1322 The complex with cerous nitrate contains three molecules of aminopyrine.1238 A few other substituted... 

Transfer 2.4 ml of the buffered alizarin and 20 ml of distilled water to a 50 ml beaker. Add 1 ml of test solution and mix. Finally add 2 ml of cerous nitrate solution and mix again. Prepare a similar blank solution. When fluorine is present a mauve colour will be developed in the test solution compared with a pink colour in the blank. If a semi-quantitative estimation of fluorine is required measure the optical density of the test solution against the blank at 600 nm in 10 mm cells. Useful calibration figures are given below ... 

Two series of 20-40 mesh y-alumina and silica supported Ni-based catalysts were prepared by the incipient wetness impregnation with nitrate as the metal precursors. The solids were dried overnight in air at 393 K, then calcined at 773 K in air for 6 hrs for complete decomposition of the precursors. For the promoted catalysts, magnesium nitrate and cerous nitrate were added to the support by the same method. Before the reaction, the catalyst was reduced at 973 K in a stream of H2 (99.995%) for at least 2 hrs. 

Even the simplest case of one-to-one entrainment at a common frequency offers a surprisingly rich array of possibilities. Crowley and Epstein (1989) studied the behavior of two coupled BZ oscillators in the experimental configuration shown in Figure 12.2. They used acetylacetone instead of malonic acid to prevent the formation of carbon dioxide bubbles. The compositions of the feedstreams (sodium bromate, cerous nitrate, sulfuric acid, acetylacetone) were the same for the two CSTRs, except that the acetylacetone concentration was 0.015 M for one reactor and 0.016 M for the other. This difference gave rise to a difference in uncoupled frequencies of about 15%, with tq = 99.6 s for one reactor and 112 s for the other. In Figure 12.7, we see what happens as the coupling parameter p, the ratio of the mass fiow between reactors to the mass flow through each CSTR, is increased. 

Miscellaneous Various Fluorine Schoniger combustion spectrophotometric evaluation of alizarin cerous nitrate complex at 610 nm [106]... 

The spatial structures recorded from sealed tubes (10 mm diameter) were obtained in the Belousov Zhabotinskii reaction medium under similar conditions with initial concentrations potassium bromate 0.09M, sulphuric acid 0.4M, malonic acid 0.3M and cerous nitrate 1.2mM, Sufficient ferroin dye was included for a visual colour contrast of pastel blue waves in pale orange background to be enhanced by black and white photography (1, 2). 

Cerous nitrate, 0.0005 M, standardise approximately 0.02 M cerous nitrate by titration against standard etbylenediaminetetraacetic acid solution at pH 6 with xylenol orange as indicator. To a suitable volume of this solution (about 50 ml) add 0.2 ml of concentrated nitric acid, 0.1 g of hydroxylamine hydrochloride and sufficient water to produce 2 litres and filter. 

In each of a series of 100 ml calibrated flasks place 50 ml of distilled water, an accurately measured volume between 2 and 8 ml of standard fluoride solution, 10 ml of alizarin complexan solution and 3 ml of acetate buffer solution. Mix each solution thoroughly, add 10 ml of 0.0005 M cerous nitrate, dilute to the mark with distilled water and set aside, protected from direct light for 1 hour. At the same time, prepare a blank solution in a similar fashion by omitting the standard fluoride solution. Measure the optical densities of the test solutions against the blank in 4 cm cells at 610 nm and plot a graph of optical density against amount of fluoride present. 

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